表：t_test -------------------------------------- id(int) cost(int) des Autoid(id) -------------------------------------- 1 10 aaaa 1 1 15 bbbb 2 1 20 cccc 3 2 80 aaaa 4 2 100 bbbb 5 2 60 dddd 6 3 500 dddd 7 -------------------------------------- 取每一类id中cost最大的纪录
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